Hi there, if I list 30 books on my online store for sale through ebay and i just sell 50 percent of it i would need to pay for unsold books

If you list via an online store you will pay listing fees for all of the items and final value fees as well for the ones which sell.

If you list as a non-store owner you get 30 free listings a month, and pay nothing for the ones which dont sell and just the final value fee on those which do. (plus paypal fees of course via your Premier Paypal account).

Integrity is priceless.
“I would prefer even to fail with honor than to win by cheating”. Sophocles

ANNNNDDDddddd...

...if you open an eBay Store then you can list multiple items under 1 listing. So you could either:

a) list 30 separate books, or

b) list 30 identical books under one listing.

In the case of a) you would pay 5c times 30 = $1.50 for the month.

In the case of b) you would pay 5c for all 30 listings for the month.

If you didn't have a store, then your 30 listings must be separate but they would be free (for the first 30 only). And you can only list for 10 days, not a whole month.

You don't get any refund on listing fees. You pay Final Value Fees on any items that you actually sell. So if you sold 15 books, you would pay fees on all those 15 irrespective of whether you used my example a) or b) or if you didn't have an ebay Store.